Temper-screw box for oil-wells



(No Model.)

J. D. CAMERON. TEMPER SCREW BOX FOR OIL WELLS.

N0. 255,591. Patented Mar. 28,1882;

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JOHN D. CAMERON, on BR PATENT OFFICE.

ADFORD, PENNSYLVANIA.

TEMPER-SCREW BOX FOR OIL-WELLS.

sPEcIFIcATIoN forming part of Letters Patent No. 255,591, dated March28, 1882.

Application filed August 22, 1881. (N0 model.)

To all whom tt maymoncern:

Be it known that I, JoHN D. CAMERON, of Bradford, Pennsylvania, haveinvented new and useful Improvements in Temper-Screw Boxes forOil-Wells; and I do hereby declare that the following is a full, clear,and exact description thereof, reference being bad to the accompanyingdrawings and the letters or figures of reference marked thereon.

Temper-screw boxes n w in use are made by welding up a mass of metal inthe shape of a cylinder, then boring a hole from end to end,cuttingserew-threadsin this hole to correspond with those in the screw,and finally by sawing the box in two parts on a line parallel to theAfter the threads in this box become worn out the. same process must bepassed through to make the temperscrew of any value. Thisprocess is bothexpensive and laborious.

The object of my invention is to do away to-a certain extent the cost ofrenewing the threads in the manner described above, and also produce anarticle much superior to that now in use.

To that end the nature of my invention consisls of parts andcombinations of parts that will hereinafter be described and claimed.

In the drawings, Figure 1 represents a vertical section ofa temper-screwbox having part of the reins and screw attached thereto; Fig. 2, adetail view, showing the box in section and Fig. 3, an interior view ofone of the screwboxes, showing the dovetails at another point from thoseshown in Figs. 1 and 2.

A A represent the reins; B, the screw; 0, the box; 0, the removablescrew-boxes; and D, the oval ring or strap, which, in combination withthe hand-screw D, clamps the parts together.

' The box 0 is formed of two semieylindrical pieces having upon theirinner faces dovetail grooves 0. These grooves may be of any desiredshape and formed at any point upon the inner faces of the box.

Screw -boxes 0' are two semi-cylindrical pieces having screw-threadsupon their inner faces to correspond with those upon screw B, anddovetails 0 upon their outer faces at a point to correspond and to fitwithin grooves c of the box. The manner of attaching these screw-boxesis very simple. The box is spread apart a sufficient distance to allowthe end of I i one of the dovetails to be inserted in the groove l andthe screw-box forced around until the ends correspond or are on the sameplane as the ends of the box. The other screw-box is inserted in thesame manner. To prevent them from slipping, a handscrew, 0, having itspoint in contact with the dovetail, is inserted through a screw'hole onthe side of each semicylindrical piece of the box, as shown in Fig. 2.

It can readily be seen by using myimprovement that the screw-threads canbe renewed by simply removing the screwboxes from the box and insertinga new set.

I design to sell the temper-screw in the condition partly shown in Fig.1, and to have sets of screw-boxes on sale in the stores, where they canbe had at a very slight cost compared with the cost of making newscrewsin an old box, as is now the custom. This will be a great savingof time and money, as it is frequentlythe case that drilling in wells issuspended because the temper-screw is in the shop.

I do not limit myself in attaching my device to the manner shown in thedrawings, as it is obvious that they could be attachedin many differentways without departing from my invention.

What I claim as new is- 1. A temper-screw box of cylindrical shape,havingremovablesemi-cylindricalscrew-boxes supported by means of aflange or half-collar projecting from their bodies, substantially asdescribed, and in the manner set forth.

2. A temper-screw having a box provided with removable screw-boxesattached by means of dovetails, substantially in the manner described.

3. A temper-screw having a box provided with dovetail grooves, incombination with removable screw-boxes having dovetails, substantiallyas described.

4. A temper-screw box having removable dovetailed screw-boxes fittingwithin dovetailed grooves, and hand-screws for holding the screw-boxesin place.

In testimony that I claim the foregoing I have hereunto set my hand this15th day of August, 1881.

J. D. CAMERON.

